As in: “Such resistance exposes the intrinsic difficulties in accounting for and defining biraciality, multiethnic identifications, and other interstitial modes of being in Hawai’i that cannot be easily categorized, further revealing how such identities are necessarily complex and sometimes even contradictory” (Milne, 2018, p.191).
Milne, L. (2018). The melting pot boiled over: Hawaiian American ethnicities and self-authorship in Lois-Ann Yamanaka’s Name Me Nobody and Blu’s Hanging. In Y. Mathison (Ed.), Growing up Asian American in young adult fiction (pp. 187-206). Jackson, MS: University Press of Mississippi.
For definitions of interstitial, consult the Oxford English Dictionary.